/*
 *  Copyright 2008-2010 NVIDIA Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */


/*! \file unique.h
 *  \brief Dispatch layer for unique().
 */

#pragma once

#include <thrust/iterator/iterator_categories.h>

#include <thrust/detail/host/unique.h>
#include <thrust/detail/device/unique.h>

namespace thrust
{
namespace detail
{
namespace dispatch
{

////////////////
// Host Paths //
////////////////

template <typename ForwardIterator,
          typename BinaryPredicate>
ForwardIterator unique(ForwardIterator first,
                       ForwardIterator last,
                       BinaryPredicate binary_pred,
                       thrust::host_space_tag)
{
    return thrust::detail::host::unique(first, last, binary_pred);
}

template <typename InputIterator,
          typename OutputIterator,
          typename BinaryPredicate>
OutputIterator unique_copy(InputIterator first,
                           InputIterator last,
                           OutputIterator output,
                           BinaryPredicate binary_pred,
                           thrust::host_space_tag,
                           thrust::host_space_tag)
{
    return thrust::detail::host::unique_copy(first, last, output, binary_pred);
}

template <typename ForwardIterator1,
          typename ForwardIterator2,
          typename BinaryPredicate>
  thrust::pair<ForwardIterator1,ForwardIterator2>
  unique_by_key(ForwardIterator1 keys_first, 
                ForwardIterator1 keys_last,
                ForwardIterator2 values_first,
                BinaryPredicate binary_pred,
                thrust::host_space_tag,
                thrust::host_space_tag)
{
    return thrust::detail::host::unique_by_key
        (keys_first, keys_last, values_first, binary_pred);
}

template <typename InputIterator1,
          typename InputIterator2,
          typename OutputIterator1,
          typename OutputIterator2,
          typename BinaryPredicate>
  thrust::pair<OutputIterator1,OutputIterator2>
  unique_copy_by_key(InputIterator1 keys_first, 
                     InputIterator1 keys_last,
                     InputIterator2 values_first,
                     OutputIterator1 keys_output,
                     OutputIterator2 values_output,
                     BinaryPredicate binary_pred,
                     thrust::host_space_tag,
                     thrust::host_space_tag,
                     thrust::host_space_tag,
                     thrust::host_space_tag)
{
    return thrust::detail::host::unique_copy_by_key
        (keys_first, keys_last, values_first, keys_output, values_output, binary_pred);
}

//////////////////
// Device Paths //
//////////////////

template <typename ForwardIterator,
          typename BinaryPredicate>
ForwardIterator unique(ForwardIterator first,
                       ForwardIterator last,
                       BinaryPredicate binary_pred,
                       thrust::device_space_tag)
{
    return thrust::detail::device::unique(first, last, binary_pred);
}

template <typename InputIterator,
          typename OutputIterator,
          typename BinaryPredicate>
OutputIterator unique_copy(InputIterator first,
                           InputIterator last,
                           OutputIterator output,
                           BinaryPredicate binary_pred,
                           thrust::device_space_tag,
                           thrust::device_space_tag)
{
    return thrust::detail::device::unique_copy(first, last, output, binary_pred);
}

template <typename ForwardIterator1,
          typename ForwardIterator2,
          typename BinaryPredicate>
  thrust::pair<ForwardIterator1,ForwardIterator2>
  unique_by_key(ForwardIterator1 keys_first, 
                ForwardIterator1 keys_last,
                ForwardIterator2 values_first,
                BinaryPredicate binary_pred,
                thrust::device_space_tag,
                thrust::device_space_tag)
{
    return thrust::detail::device::unique_by_key
        (keys_first, keys_last, values_first, binary_pred);
}

template <typename InputIterator1,
          typename InputIterator2,
          typename OutputIterator1,
          typename OutputIterator2,
          typename BinaryPredicate>
  thrust::pair<OutputIterator1,OutputIterator2>
  unique_copy_by_key(InputIterator1 keys_first, 
                     InputIterator1 keys_last,
                     InputIterator2 values_first,
                     OutputIterator1 keys_output,
                     OutputIterator2 values_output,
                     BinaryPredicate binary_pred,
                     thrust::device_space_tag,
                     thrust::device_space_tag,
                     thrust::device_space_tag,
                     thrust::device_space_tag)
{
    return thrust::detail::device::unique_copy_by_key
        (keys_first, keys_last, values_first, keys_output, values_output, binary_pred);
}

} // end namespace dispatch
} // end namespace detail
} // end namespace thrust